If I recall correctly, I used the cattle skull thrice for Reachmen sacral spaces in my old claim. You can check it here, vrolok, if you are interested.

I applaud the idea of these skull armors, as long as they are used for ritualistic means solely. Maybe just in the form of a 'cuirass' - a painted skull mounted to the back with leather straps, fastened on a chest in X-shape? It might be hard to make it compatible with body replacers, though.